Balance is related to player progression, game difficulty
escalation, and reward/punishment fairness. Balance is tested
by progression testing, where players need to traverse and
progress the game to feel the balance of difficulty and the
fairness of reward/punishment, then continued by questionnaire
and some metric calculation such as duration of survivability,
degree of fairness, and game learning curve. Game learning
curve is related to type of fun in games and with the
questionnaire, it can be determined whether the game learning
curve is ideal to the game type or not